Abrasive wheel



NQV 28, 1939. 4 J. BURNS 2,181,547

ABRAS IVE WHEEL Filed Aug. 24, 1938 'llllllllllLlllllll'llrlll'l l u l IIlIlllrlllllllllllllll|||JI||A joseph ABur/1,8

INVENTOR 72 ATTORNEYS Patented Nov. 28, 1939 PATENT orf-'ICE ABRAsTvE WHEEL Joseph Burns, Milwaukee, Wis. Application August 24, 193s, serial No. 226,567

2 Claims.

My invention relates to the art of grinding, polishing and buing and includes among its objects and advantages the provision of an im-v nuted abrasive inside a drum rotated at suchspeed as to provide an abrasive surface for grinding articles. The drum is rotated at suicient speed/to `hold the abrasive in pressure relation with the face of the drum through the action of centrifugal forces. 'I'he compactness of the body of abrasive about the Wall of the drum is determined by the speed of the drum, while the flexibility of the abrasive body at low speeds is such as to readily accommodate itself to articles of diiferent shapes. Rotation of the drum at a relatively high speed will render the abrasive body relatively solid. In processing certain types of articles, the abrasive body may be trued by holding a straight edge thereagainst so as to provide a perfectly smooth abrasive surface. While in most cases the abrasive will be held against the face of the drum and travel at the peripheral speed of the drum, my invention contemplates means for deflecting the comminuted abrasive out of its normal course for processing articles of exceptionally irregular configuration. Since the abrasive takes the configuration of the drum because of centrifugal forces, the cutting properties of the abrasive is not impaired by any vehicle such as glue or rosin.

In the accompanying drawing:

Figure l is an end view of the invention with parts of the drum broken away for the sake of clearness; and

Figure 2 is a sectional view along the line 2 2 of Figure 1.

In the embodiment selected to illustrate my invention, I make use of a support I0 which rotatably supports the abrasive containing drum I 2. Drum I2 includes a peripheral Wall I4 terminating in side flanges I6. Figure 1 illustrates the plate and the reaches 30 rotatably support fianged wheels 32 similar to the wheels 26. Figure 1 illustrates the wheel units as being spaced ninety degrees about the peripheral Wall I4. A sleeve 34 is formed integrally with the plate I8 5 and is bored to looselyreceive the motor shaft 36. Through the outer end of the motor shaft 36 I connect a pinion 38 which is arranged in mesh with a gear 40 attached to the peripheral wall I4. Thus operation of the motor 42 will rotate the l0 drum I2. Support I Il is maintained in an upright position through the medium of brackets 44 connected with the plate I8 and attached to the motor housing by bolts 46.

In operation the drum I2 is provided with a 15 supply of comminuted abrasive 48. Through rof tation of the drum I2 the comminuted abrasive will accumulate in a body about the peripheral wall I4 because of centrifugal forces. The drum I2 together with the flanges I6 is of suiiicient di- 20 ameter to permit articles to be processed to be inserted inside the drum. The abrasive 48 will form an abrasive wall 5D against which articles may be held for grinding, polishing or bufng purposes. 'I'he degree of compactness or solidity 25 of the abrasive wall 50 will depend upon the speed at which the drum I2 is rotated. The speed of the drum will depend upon the nature of the Work being processed. A'loW speed will lend looseness to the abrasive wall 50 so that articles may easily l30 kbe partly embeddedtherein for grinding, polishing or bufng irregular surfaces. The abrasive wall may be trued by holding a straight edge thereagainst to provide a perfectly smooth surface'. `Rotation of the drumat an exceedingly 35 high speed will provide an abrasive wall of considerable solidity. y L

In some cases it may be desirable to deflect the material of the abrasive Wall 50 out of its true course for grinding, polishing or buing various 40 types of articles. Plate I8 may be provided with a right-angular flange 52 to which brackets r54 are iixedly connected, as by Welding. Figure l illustrates one bracket 54 only but the two brackets are identical in construction and spaced to extend inwardly partly across the ends of the drum for supporting a deflecting plate 56. Plate 56 is curved as at 58 and has its edge 60 lying in abrasive collecting relation with the inner face of the peripheral wall I4.

Rotation of the drum I2 in the direction of the arrow 62 will cause the abrasive to be deflected in a stream 64 and thrown upon the opposite side of the drum, as` at 66. Stream B4 may beutilized for many purposes, but in Figure l I have illustrated the stream as being employed for polishing a moldboard 68. Bracket 10 may be employed for lending support to the moldboard 68. Many articles may be supported by hand and held in the path of the stream 64 for grinding, polishing or bung purposes. Motor 42 includes a base 12 which may be xedly anchored to any suitable support so as to effectively balance the support I0 and its associated drum l2.

Without further elaboration, the foregoing will so fully illustrate my invention that others may, by applying current knowledge, readily adapt the same for use undervvarious conditions of service.

I claim:

l. A device of the type described comprising a drum mounted for rotation, said drum including a comminuted abrasive collecting face, means for rotating the drum, and an abrasive deflecting means located inside the drum for deflecting the abrasive out of its normal course in the form of an abrading stream across the drum for co1- lection on its opposite side.

2. A device of the type described comprising a drum having inwardly extending anges at its ends, the wall of the drum constituting a comminuted abrasive collecting surface, means for rotating the drum, a defleoting plate located inside the drum for deecting abrasive out of its normal course in the form of an abrading stream across the drum, and a support for said deecting plate.

JOSEPH BURNS. 

